High-speed and high-linearity grid voltage bootstrap switching circuit

Abstract

The invention, which belongs to the technical field of analog circuit, discloses a high-speed and high-linearity grid voltage bootstrap switching circuit. According to the invention, GN node signals generated by a fourth PMOS transistor, an eighth NMOS transistor and a seventh NMOS transistor are used for controlling the grid electrode of the fourth NMOS transistor; in addition, the same signal, namely a GN node signal, is used for controlling a substrate of a sampling switch tube, so that the substrate potential of the sampling switch tube is kept consistent with the grid potential during sampling, and thus the speed of the circuit is increased; the parasitic capacitance of the grid terminal of the sampling switch tube is reduced by reducing the number of the tubes connected with the gridterminal of the sampling switch tube; meanwhile, the bulk effect in the secondary effect of the MOS tube is reduced, the linearity of the sampling switch tube is ensured, and finally, the precisionof the sampling switch circuit is improved.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, and in particular relates to a high-speed and high-linearity gate voltage bootstrap switch circuit, which can be used in a sample-and-hold circuit. Background technique [0002] With the advancement of integrated circuit technology and the rapid growth of communication and multimedia markets, digital signal processing technology has also been rapidly developed and widely used in various fields. Digital signals have the advantages of strong anti-interference ability, easy integration, low power consumption, and low cost. Therefore, more and more analog signal processing is gradually replaced by digital signal technology. However, light, heat, sound, electricity, magnetism and other signals in nature are all analog quantities. In order to make these analog signals be processed by digital systems, it is necessary to convert these time-continuous analog signals into discrete digita...

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Problems solved by technology

[0009] By using the gate voltage bootstrap switch circuit, the gate-source voltage V of the sampling switch tube is reduced GS The nonlinear distortion caused by the change, but it ignores the sampling switch conduction threshold voltage V caused by the body effect TH0 Non-linear problems brought about by the changes, and there are also challenges in the application of high-speed ADCs

This is because the traditional gate voltage bootstrap switch has a large parasitic capacitance because the gate terminal of the sampling switch SW is connected to multiple MOS transistors, which causes the gate voltage of SW to decrease compared with the ideal value, and at the same time Affect the overall speed of the circuit; and the body effect of the switch tube SW will affect the linearity of the circuit

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